Nestled in the heart of Sivasagar, Assam, D Block Ongc Colony stands out as a premier residential complicated, offering a serene and elegant living experience for families seeking a 4 BHK apartment. Known for its well-maintained facilities and strategic location, this colony is an ideal choice for those who desire a perfect blend of comfort, convenience, and connectivity. Let's dig into what makes D Block Ongc Colony such a compelling option for your next home. The Perfect Abode for Your Family A 4 BHK apartment at D Block Ongc Colony is designed with the modern family in mind. With ample space spread across four bedrooms, you can guarantee each member of your family enjoys privacy and comfort.